Sony AIWA XR-MN5 Service Manual page 27

E-F Balance Adjustment
Connection:
BD board
TP (TE)
TP (VC)
(CD) button. (The tracking servo and the
Procedure:
1. Connect an oscilloscpe to test point TP (TE) and TP (VC) on
the BD board.
2. AC is put in pushing
u
mode.
3. Put the disc (YEDS-18) in to playback the number five track.
4. Press the (CD) button. If it plays, press the
u
button again. (The tracking servo and the sledding servo are
turned OFF)
5. Check the level B of the oscilliscope's waveform and the A
(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 10%
Traverse Waveform
0V
6. Press the u (CD) button. (The tracking servo and sledding
servo are turned ON)
Rotate RV101 on BD board and adjust the C (DC voltage)
is almost equal to the A (DC voltage) in step 4.
7. To exit from this mode, turn the power off.
Notes: • Always move the optical pick-up to most inside track when
exiting from this mode. Otherwise, a disc will not be unloaded.
• Do not run the sled motor excessively, otherwise the gear can
be chipped.
Traverse Waveform
0V
Tracking servo
Sled servo
OFF
Checking Location: BD board (Side B)
oscilloscope
+
–
(CD) button to enter the CD test
(CD)
u
Center of
the waveform
B
A (DC
voltage)
level: 1.0 ± 0.5 Vp-p
C (DC
voltage)
Tracking servo
Sled servo
ON
Checking Location:
– BD BOARD (Side B) –
RV101 TP2
E-F Balance (TE)
TP6
Adjustment
(RFDC)
TP8
(RFAC)
TP7
TP4
(VC)
(FE)
IC103
CX-LMN5
IC101
25